13557493 has 2 divisors, whose sum is σ = 13557494. Its totient is φ = 13557492.

The previous prime is 13557473. The next prime is 13557527. The reversal of 13557493 is 39475531.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13490929 + 66564 = 3673^2 + 258^2 .

It is an emirp because it is prime and its reverse (39475531) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 13557493 - 2¹⁷ = 13426421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13557473) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6778746 + 6778747.

It is an arithmetic number, because the mean of its divisors is an integer number (6778747).

Almost surely, 2^13557493 is an apocalyptic number.

It is an amenable number.

13557493 is a deficient number, since it is larger than the sum of its proper divisors (1).

13557493 is an equidigital number, since it uses as much as digits as its factorization.

13557493 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 56700, while the sum is 37.

The square root of 13557493 is about 3682.0501082956. The cubic root of 13557493 is about 238.4476955624.

The spelling of 13557493 in words is "thirteen million, five hundred fifty-seven thousand, four hundred ninety-three".